package com.wangyu.talents.web.system.user.utils;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * Spring工具类，可以获取bean
 *
 * @author wangyu
 * @Date 2018-09-02 10:09
 */
@Component
public class SpringUtil implements ApplicationContextAware {

  private static ApplicationContext applicationContext = null;

  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    if (SpringUtil.applicationContext == null) {
      SpringUtil.applicationContext = applicationContext;
      System.out.println("========ApplicationContext配置成功" + applicationContext + "========");
    }
  }

  public static ApplicationContext getApplicationContext() {
    return applicationContext;
  }

  /**
   * 获取对象
   *
   * @return Object 一个以所给名字注册的bean的实例
   */
  @SuppressWarnings("unchecked")
  public static <T> T getBean(String name) throws BeansException {
    return (T) getApplicationContext().getBean(name);
  }

  /**
   * 获取类型为requiredType的对象
   */
  public static <T> T getBean(Class<T> clz) throws BeansException {
    T result = getApplicationContext().getBean(clz);
    return result;
  }

  /**
   * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
   *
   * @return boolean
   */
  public static boolean containsBean(String name) {
    return getApplicationContext().containsBean(name);
  }

  /**
   * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
   *
   * @return boolean
   */
  public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
    return getApplicationContext().isSingleton(name);
  }

  /**
   * @return Class 注册对象的类型
   */
  public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
    return getApplicationContext().getType(name);
  }

  /**
   * 如果给定的bean名字在bean定义中有别名，则返回这些别名
   */
  public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
    return getApplicationContext().getAliases(name);
  }

}
